Liunx basic commands (repeated descriptions of user management and difficulties)

Hello everyone, this time I spoke about the content of the user group, but I divided the content into two parts, each of which was labeled, because this part was really messy when I was studying it, so I enhanced his record. I hope you can practice more. Come on.

Create a user:

Useraddd wo

Delete all user content:

Userdel-r wo

Locked account:

Usermod-L wo

Unlock account: (xiao2

Usermod-U wo

Lock User Password

Passwd-l

Unlock User Password

Passwd-u

View User Password status

Passwd-S

Modify user uid

Usermod-u 500 wo

Modify user gid

Usermod-g 500 wo

Recursively modify all user IDs

Usermod-R 500 wo

Modify the user owner:

Usermod-l old name

Modify the user's own group and modify the user's original additional group name)

Groupmod-n old name

Add an additional group a, B, and c under user wo.

Usermod-G a, B, c wo

Usermod-a, B, c wo

Delete multiple additional groups in a user:

Gpasswd-d user group [root @ 0425 ~] # Gpasswd-d a, B, c wo

The user "a, B, c" is being deleted from the "wo" group.

Gpasswd: Unknown member a, B, c

One user adds multiple additional groups:

Usermod-G group, group, the group user overwrites the original additional group except the main group ,)

Usermod-a-G group, group, group users add new additional groups

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Delete group:

[Root @ 0425 ~] # Groupdel c

Add multiple users to a group:

Gpasswd-M User, user group

Delete multiple users in a group:

[Root @ 0425 ~] # Gpasswd-d wo zu

Change the environment variable to display byebye when the user logs out !!!! ----- How to set this?

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Modify file permissions:

Chmod u g o xu

Modify the object owner

Chown wo xu

Modify the object owner group :-

Chown. wo xu

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